<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<button type="button" class="btn btn-primary">（首选项）Primary</button>
<div id="app">
  {{massage}}

</div>
<!-- 开发环境版本，包含了有帮助的命令行警告 -->
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
    var app=new Vue({
      el:"#app",
      data:{
          massage:"Hello world"
      }
    })
</script>
</body>
</html>